The Revels were shown on static display only, a situation quite common at CEDIA (in contrast to CES where there's a whole hotel devoted to high-end audio demos). There are sound rooms on the show floor at CEDIA, either provided to manufacturers by CEDIA or fabricated by the companies themselves in their booths. Harman did have an elaborate and impressive AV demo in a room they constructed themselves, but it used JBL speakers.
My only disappointment with the Concerta2 line (without, to be fair, a detailed audition) is the lack of a 3-way center that the original Concertas offered.